import { Buffer } from 'buffer'

//将base64转换为文件
export function dataURLtoFile(dataurl) {
  var arr = dataurl.split(','),
      mime = arr[0].match(/:(.*?);/)[1],
      bstr = Buffer.from(arr[1],'base64'),
      n = bstr.length,
      u8arr = new Uint8Array(n);
  while (n--) {
      u8arr[n] = bstr.charCodeAt(n);
  }
  return new Blob([u8arr], { type: mime });

}

